US11216096B2 - Touch display panel, method of manufacturing the same, method of driving the same, and touch display device - Google Patents

Touch display panel, method of manufacturing the same, method of driving the same, and touch display device Download PDF

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US11216096B2
US11216096B2 US16/621,832 US201916621832A US11216096B2 US 11216096 B2 US11216096 B2 US 11216096B2 US 201916621832 A US201916621832 A US 201916621832A US 11216096 B2 US11216096 B2 US 11216096B2
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electrode
strips
touch
array substrate
display panel
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US20210141476A1 (en
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Xiangdan Dong
Yunsheng XIAO
Tingliang Liu
Hongwei Ma
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • H01L27/323—
    • H01L27/3246—
    • H01L27/3258—
    • H01L27/3276—
    • H01L51/5209—
    • H01L51/5225—
    • H01L51/5253—
    • H01L51/56—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/813—Anodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/124—Insulating layers formed between TFT elements and OLED elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H01L2251/558—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8051—Anodes
    • H10K59/80515—Anodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a touch display panel, a method of manufacturing the same, a method of driving the same, and a touch display device.
  • OLED display devices have attracted more and more attention and are increasingly favored by the display industry due to their advantages of self-luminescence, high contrast, high color gamut, wide viewing angle, light and thin structure, and compatibility with flexible substrates, and are referred to as one of the next-generation display technologies. Moreover, with the continuous development of display technologies, touch structures are increasingly being integrated into the OLED display devices.
  • a touch display panel includes: an array substrate; a pixel defining layer disposed on a side of the array substrate; a plurality of light-emitting layers correspondingly disposed in a plurality of sub-pixel regions defined by the pixel defining layer; a plurality of electrode dividing strips disposed on a side of the pixel defining layer away from the array substrate, the plurality of electrode dividing strips dividing a touch area of the touch display panel into a plurality of strip-shaped areas; and a divided electrode layer disposed on a side of the plurality of electrode dividing strips away from the array substrate and disposed in the plurality of strip-shaped areas.
  • the divided electrode layer includes: a plurality of first electrode strips correspondingly located in the plurality of strip-shaped areas; and a plurality of second electrode strips correspondingly located on surfaces of the plurality of electrode dividing strips away from the array substrate, the plurality of second electrode strips being insulated from the plurality of first electrode strips.
  • the touch display panel further includes: a first level signal terminal and a first touch signal terminal. At least one of the plurality of first electrode strips is connected to the first level signal terminal, and any adjacent two of the first electrode strips are configured to form a loop; each of the plurality of second electrode strips is connected to the first touch signal terminal, and any two of the plurality of second electrode strips are insulated from each other.
  • the touch display panel further includes a plurality of first level signal lines disposed at least at edge areas at both sides of the touch area. At least one of the plurality of first level signal lines is perpendicular to at least one of the plurality of first electrode strips, and both ends of each of the plurality of first electrode strips are respectively electrically connected first level signal lines to the plurality of first level signal lines at corresponding sides.
  • the touch display panel further includes: a first level signal terminal and a first touch signal terminal.
  • Each of the plurality of first electrode strips is connected to the first level signal terminal and the first touch signal terminal, and any two of the plurality of first electrode strips are insulated from each other.
  • a shape of the touch area includes a rectangle.
  • the plurality of first electrode strips extend along a length direction of the touch area.
  • the plurality of first electrode strips extend along a width direction of the touch area.
  • a material of at least one of the plurality of electrode dividing strips includes a positive photoresist.
  • a shape of a cross section of the at least one of the plurality of electrode dividing strips perpendicular to a direction in which the at least one of the plurality of electrode strips extends is a trapezoid.
  • a length of a side of the trapezoid away from the array substrate is less than a length of a side of the trapezoid proximate to the array substrate.
  • a material of at least one of the electrode plurality of dividing strips includes a negative photoresist.
  • a shape of the cross section of the at least one of the plurality of electrode dividing strips perpendicular to a direction in which the electrode strip extends is an inverted trapezoid.
  • a length of a side of the inverted trapezoid away from the array substrate is greater than a length of a side of the inverted trapezoid proximate to the array substrate.
  • a direction in which at least one of the plurality of electrode dividing strips extends is parallel to a column direction of the plurality of sub-pixel regions, and at least one column of the plurality of sub-pixel regions is disposed between any adjacent two electrode dividing strips in the plurality of electrode dividing strips.
  • a direction in which at least one of the plurality of electrode dividing strips extends is parallel to a row direction of the plurality of sub-pixel regions, and at least one row of the plurality of sub-pixel regions is disposed between any adjacent two electrode dividing strips in the plurality of electrode dividing strips.
  • At least one of the plurality of first electrode strips is located on a surface of a light-emitting layer away from the array substrate in a corresponding sub-pixel region in the plurality of sub-pixel regions.
  • a thickness of the electrode dividing strip in a direction perpendicular to the array substrate is 1 ⁇ m to 2 ⁇ m, and a thickness of the divided electrode layer in a direction perpendicular to the array substrate is 10 nm to 20 nm.
  • the touch display panel further includes; a thin film encapsulation (TFE) layer disposed on a side of the divided electrode layer away from the array substrate; a touch electrode layer disposed on a side of the TFE layer away from the array substrate; and a second touch signal terminal.
  • the touch electrode layer includes a plurality of third electrode strips disposed across the plurality of first electrode strips or the plurality of second electrode strips, the plurality of third electrode strips are respectively connected to the second touch signal terminal, and any two of the plurality of third electrode strips are insulated from each other.
  • At least one of the plurality of third electrode strips is perpendicular to at least one of the plurality of first electrode strips or at least one of the plurality of second electrode strips.
  • a method of manufacturing a touch display panel includes:
  • the divided electrode layer is divided by the plurality of electrode dividing strips to form a plurality of first electrode strips located in the plurality of strip-shaped areas and a plurality of second electrode strips located on surfaces of the plurality of electrode dividing strips away from the array substrate, and the plurality of second electrode strips are insulated from the plurality of first electrode strips.
  • the method of manufacturing the touch display panel further includes:
  • the touch electrode layer including a plurality of third electrode strips disposed across the plurality of first electrode strips or the plurality of second electrode strips, and any two of the plurality of third electrode strips being insulated from each other.
  • a method of driving a touch display panel includes: applying a first level signal to a plurality of first electrode strips in a time of a single frame, and making a plurality of second electrode strips transmit first touch signals respectively.
  • a method of driving a touch display panel includes: applying a first level signal to a plurality of first electrode strips in a display period in a time of a single frame; and making a plurality of first electrode strips transmit first touch signals respectively in a touch period in the time of the single frame.
  • a touch display device in yet another aspect, includes the touch display panel as described above.
  • each of the plurality of first electrode strips is disposed in a corresponding one of the plurality of strip-shaped areas; and each of the plurality of second electrode strips is disposed on a surface of a corresponding one of the plurality of electrode dividing strips away from the array substrate.
  • the first level signal terminal includes at least one of the plurality of first level signal lines.
  • a method of driving another touch display panel includes: applying a first level signal to a plurality of first electrode strips in a time of a single frame, and making a plurality of second electrode strips transmit first touch signals respectively.
  • FIG. 2 is a schematic cross-sectional view of a touch display panel according to some embodiments of the present disclosure
  • FIG. 3 is a schematic cross-sectional view of another touch display panel according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic plan view of a touch display panel according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic plan view of another touch display panel according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic plan view of yet another touch display panel according to some embodiments of the present disclosure.
  • FIG. 7 is a flow chart of a method of manufacturing a touch display panel according to some embodiments of the present disclosure.
  • FIG. 8 is a flow chart of another method of manufacturing a touch display panel according to some embodiments of the present disclosure.
  • FIGS. 9 to 15 are schematic diagrams showing steps of the method of manufacturing the touch display panel shown in FIG. 8 ;
  • FIG. 16 is a timing control diagram of a method of driving a touch display panel according to some embodiments of the present disclosure.
  • FIG. 17 is a schematic structural diagram of a touch display device according to some embodiments of the present disclosure.
  • touch sensing modules are attached to an OLED display panel of the OLED display device;
  • MLOC multi-layer on cell
  • TFE thin film encapsulation
  • a cathode layer of an OLED display panel of the OLED display device is patterned to form a plurality of block electrodes, which are reused to realize a cathode function and a touch sensing function.
  • the above structures 1) and 2) have disadvantages of a complex structure, a thick display panel, and a high manufacturing cost.
  • the structure 3) has advantages of a simple structure, a light and thin display panel, and a low manufacturing cost, after the cathode layer is patterned to form block electrodes, a resistance at cathodes (i.e., the block electrodes) will be significantly increased. Consequently, a voltage drop at the cathodes will increase dramatically, resulting in higher power consumption of the display panel.
  • an OLED display panel is used as an application scenario.
  • a structure of a conventional OLED display panel is briefly introduced below. It will be noted that, application scenarios on which some embodiments of the present disclosure are based are merely examples, and those skilled in the art have the ability to apply inventive concepts of some embodiments of the present disclosure to other scenarios.
  • the conventional OLED display panel 100 mainly includes: an array substrate 1 , a pixel defining layer 2 , light-emitting layers 3 , a cathode layer 4 , and a thin film encapsulation (TFE) layer 5 .
  • the array substrate 1 includes: a base substrate, a thin film transistor (TFT) array disposed on the base substrate, and a plurality of pixel electrodes disposed on a side of the TFT array away from the base substrate.
  • the plurality of pixel electrodes are connected to driving TFTs of sub-pixels in one-to-one correspondence.
  • the pixel defining layer 2 is configured to define sub-pixel regions of the OLED display panel.
  • the light-emitting layers 3 are located in the sub-pixel regions defined by the pixel defining layer 2 .
  • the cathode layer 4 covers surfaces of the pixel defining layer 2 and the light-emitting layers 3 away from the array substrate 1 .
  • a pixel electrode, a light-emitting layer 3 , and the cathode layer 4 in a sub-pixel region together constitute a light-emitting device.
  • the TFE layer 5 covers a surface of the cathode layer 4 facing away from the array substrate 1 , and serves to encapsulate all light-emitting devices.
  • some embodiments of the present disclosure provide a touch display panel 200 , which realizes integration of a touch structure into the touch display panel 200 .
  • the touch display panel 200 includes an array substrate 1 , and a pixel defining layer 2 disposed on a side of the array substrate 1 .
  • Light-emitting layers 3 are disposed in sub-pixel regions defined by the pixel defining layer 2 .
  • the touch display panel 200 further includes: a plurality of electrode dividing strips 6 disposed on a side of the pixel defining layer 2 away from the array substrate 1 , and a divided electrode layer 7 disposed on a side of the plurality of electrode dividing strips 6 away from the array substrate 1 .
  • the plurality of electrode dividing strips 6 divide a touch area into a plurality of strip-shaped areas.
  • the divided electrode layer 7 includes: a plurality of first electrode strips 71 located in the plurality of strip-shaped areas, and a plurality of second electrode strips 72 located on surfaces of the plurality of electrode dividing strips 6 away from the array substrate 1 .
  • the plurality of first electrode strips 71 are insulated from the plurality of second electrode strips 72 .
  • the touch area of the touch display panel 200 is also a display area, and the touch area includes the sub-pixel regions defined by the pixel defining layer 2 .
  • the touch area includes the sub-pixel regions defined by the pixel defining layer 2 .
  • the plurality of electrode dividing strips 6 are parallel or substantially parallel to each other, and any adjacent two electrode dividing strips 6 are separated by a certain region, so that there is a strip-shaped area between any adjacent two electrode dividing strips 6 .
  • the region between any adjacent two electrode dividing strips 6 is at least one line (one row or one column) of sub-pixel regions. Further, areas of regions between any adjacent two electrode dividing strips 6 are the same. In this way, the subsequently formed plurality of first electrode strips 71 and plurality of second electrode strips 72 are distributed evenly, which is conducive to improving performances of the touch display panel.
  • directions in which the plurality of electrode dividing strips 6 extend may be parallel to a column direction of the sub-pixel regions, or parallel to a row direction of the sub-pixel regions, which is determined according to design requirements of the subsequently formed plurality of first electrode strips 71 and plurality of second electrode strips 72 . If the electrode dividing strips 6 are parallel to the column direction of the sub-pixel regions, then at least one column of sub-pixel regions is disposed between any adjacent two electrode dividing strips 6 . If the electrode dividing strips 6 are parallel to the row direction of the sub-pixel regions, then at least one row of sub-pixel regions is disposed between any adjacent two electrode dividing strips 6 .
  • each column (or each row) of sub-pixel regions correspond to a single first electrode strip 71 and a single second electrode strip 72 .
  • first electrode strips 71 and second electrode strips 72 there will be a large number of first electrode strips 71 and second electrode strips 72 , and in turn a large number of touch points. As a result, a touch accuracy of the touch display panel 200 may be improved.
  • the multiple columns (or multiple rows) of sub-pixel regions correspond to a single first electrode strip 71 and a single second electrode strip 72 . That is, the divided electrode layer 7 is divided into a smaller number of first electrode strips 71 and second electrode strips 72 , which means that the number of first electrode strips 71 is small.
  • each first electrode strip 71 occupies a large area, which is conducive for reducing an electric resistance of the first electrode strip 71 in a case where the first electrode strip 71 (covering a light-emitting layer 3 in a corresponding sub-pixel region) is used as an electrode of a light-emitting device. Therefore, a voltage drop at the first electrode strip 71 being used as the electrode of the light-emitting device may be reduced.
  • a material forming the electrode dividing strip 6 is an insulating material. In this way, it may be possible to ensure electrical insulation between the first electrode strips 71 and the second electrode strips 72 that are subsequently formed.
  • the material forming the electrode dividing strip 6 is a photoresist. By forming a photoresist layer on the surfaces of the pixel defining layer 2 and the light-emitting layers 3 away from the array substrate 1 through a coating process, and by exposing and developing specific areas of the photoresist layer, the required electrode dividing strips 6 may be formed.
  • shapes of the formed electrode dividing strips 6 are also different.
  • the material forming the electrode dividing strip 6 is a positive photoresist. Since the positive photoresist will be changed from an insoluble photoresist to a soluble photoresist after an exposure process, regions of the photoresist layer other than regions where the electrode dividing strips are located is exposed in a process of forming the electrode dividing strips 6 . Therefore, a shape of a cross section of the finally formed electrode dividing strip 6 perpendicular to the array substrate 1 and perpendicular to a direction in which the electrode dividing strip 6 extends is a trapezoid, as shown in FIG.
  • the material forming the electrode dividing strip 6 is a negative photoresist. Since the positive photoresist will be changed from a soluble photoresist to an insoluble photoresist after the exposure process, the regions where the electrode dividing strips are located is exposed in a process of forming the electrode dividing strips 6 . Therefore, the shape of the cross section of the finally formed electrode dividing strip 6 perpendicular to the array substrate 1 and perpendicular to the direction in which the electrode dividing strip 6 extends is an inverted trapezoid, as shown in FIG. 3 .
  • trapezoid means that: of two sides of the trapezoid that are parallel to the array substrate 1 , a length of a side away from the array substrate 1 is less than a length of a side proximate to the array substrate 1 .
  • inverted trapezoid means that: of two sides of the inverted trapezoid that are parallel to the array substrate 1 , a length of a side away from the array substrate 1 is greater than a length of a side proximate to the array substrate 1 .
  • each side wall and a bottom surface (i.e., a side in contact with the pixel defining layer 6 ) of the electrode dividing strip 6 form an obtuse angle. Therefore, in a subsequent process of depositing the divided electrode layer 7 to form the first electrode strips 71 and the second electrode strips 72 at a same time, the first electrode strips 71 and the second electrode strips 72 may more easily disconnected, as compared with a case where the shape of the cross section of the electrode dividing strip 6 is a trapezoid. In other words, it may be easier to cut the divided electrode layer 7 clearly with less cutting residues.
  • a thickness of the electrode dividing strip 6 i.e., a size of the electrode dividing strip 6 in a direction perpendicular to the array substrate 1
  • a thickness of the divided electrode layer 7 in a certain way respectively, it may also be possible to ensure that the first electrode strips 71 and the second electrode strips 72 are easily disconnected and electrode material residues between the two are reduced in the subsequent process of depositing the divided electrode layer 7 to form the first electrode strips 71 and the second electrode strips 72 at the same time.
  • the thickness of the electrode dividing strip 6 may be increased as much as possible under a premise of not significantly increasing an overall thickness of the touch display panel 200 .
  • the thickness of the divided electrode layer 7 may be reduced as much as possible on a basis of ensuring that the first electrode strips 71 and the second electrode strips 72 have good electrical conductivity.
  • the first electrode strips 71 and the second electrode strips 72 may be easily separated from each other.
  • a thickness of the electrode dividing strip 6 is 1 ⁇ m to 2 ⁇ m, and a thickness of the divided electrode layer 7 is 10 nm to 20 nm. Since thicknesses of the electrode dividing strip 6 and the divided electrode layer 7 are not in a same order of magnitude, the divided electrode layer 7 may be more easily divided when the divided electrode layer 7 is being deposited on the electrode dividing strips 6 to form the first electrode strips 71 and the second electrode strips 72 .
  • the plurality of first electrode strips 71 included in the touch display panel 200 are correspondingly located in the plurality of strip-shaped areas formed after the touch area is divided by the plurality of electrode dividing strips 6 , and on surfaces of the light-emitting layers 3 away from the array substrate 1 .
  • the plurality of second electrode strips 72 included in the touch display panel 200 are correspondingly located on the surfaces of the plurality of electrode dividing strips 6 away from the array substrate 1 .
  • the first electrode strips 71 and the second electrode strips 72 are alternately arranged.
  • a plurality of first electrode strips 71 and a plurality of second electrode strips 72 may be formed at the same time, and separated and insulated from each other.
  • the touch display panel 200 has both a display function and a touch function.
  • at least one of the plurality of first electrode strips 71 is connected to a first level signal terminal (e.g., a common voltage signal terminal VSS), and any adjacent two of the first electrode strips 71 are shorted to each other.
  • a potential of each first electrode strip 71 is a potential supplied by the first level signal terminal.
  • Each first electrode strip 71 may be used as an electrode of a light-emitting device in a corresponding sub-pixel region, so as to ensure that the touch display panel has the display function.
  • each of the plurality of second electrode strips 72 is connected to a first touch signal terminal S 1 , and any two of the plurality of second electrode strips 72 are insulated from each other.
  • each second electrode strip 72 may be able to transmit a first touch signal to the first touch signal terminal S 1 , and it may be ensured that first touch signals transmitted by different second electrode strips 72 do not interfere with each other, such that the touch display panel 200 has the touch function.
  • the touch display panel 200 provided in some embodiments of the present disclosure may be able to perform the display function and the touch function simultaneously, the two functions are independent of each other and do not interference with each other much, and the touch display panel 200 has a good display effect and a high touch sensitivity.
  • the array substrate 1 includes pixel electrodes that correspond to respective sub-pixel regions, and the pixel electrodes are used as anodes of corresponding light-emitting devices.
  • Each of the plurality of first electrode strips 71 covering the light-emitting layers 3 is used as a cathode of a light-emitting device including a corresponding light-emitting layer 3 .
  • any adjacent two of the first electrode strips 71 are shorted to each other, so that the first electrode strips 71 are electrically connected to each other, even if only one or a few first electrode strips 71 are connected to the first level signal terminal (e.g., a VSS signal terminal), it may also be possible to make a potential of each first electrode strip 71 equal to a potential supplied by the first level signal terminal (e.g., a common voltage VSS).
  • a potential of each first electrode strip 71 e.g., a common voltage VSS.
  • one or a few first electrode strips 71 are connected to the first level signal terminal (e.g., the VSS signal terminal). In this way, a connection manner of the first electrode strips 71 and the first level signal terminal may be simplified.
  • the first level signal terminal e.g., the VSS signal terminal
  • VSS signal a loss of potential signal supplied by the first level signal terminal during a transmission process
  • the “first touch signal” is a driving signal or a sensing signal. If the first touch signal is a driving signal, the second electrode strips 72 are used as driving lines T (e.g., T 1 , T 2 , . . . Tn in FIG. 5 ) in the touch structure. If the first touch signal is a sensing signal, the second electrode strips 72 are used as sensing lines R (e.g., R 1 , R 2 . . . Rn in FIG. 4 ) in the touch structure.
  • the “first level signal terminal” refers to a node, a port or a wire at which corresponding first electrode strip(s) 71 is connected to a component configured to provide a first level signal (e.g., the VSS signal).
  • the “first touch signal terminal” refers to a node, a port or a wire at which the second electrode strips 72 is connected to a component configured to provide or read the first touch signal.
  • the touch display panel 200 further includes first level signal lines (hereinafter referred to as VSS signal lines) disposed at least at edge areas at both sides of the touch area A (e.g., areas A 1 and A 2 ) in the array substrate 1 .
  • VSS signal lines are perpendicular to the first electrode strips 71 , and both ends of the first electrode strips 71 are respectively electrically connected to the VSS signal lines at corresponding sides.
  • the first electrode strips 71 are shorted to each other and each first electrode strips 71 is electrically connected to the VSS signal terminal, so that a total number of wires required for the first electrode strips 71 to be shorted to each other in the touch display panel 200 may be reduced.
  • the first level signal terminal and the VSS signal line(s) are independent of each other; or, the first level signal terminal includes at least one of the VSS signal line(s).
  • a plurality of VSS signal lines are connected into a frame structure. That is, the plurality of VSS signal lines are arranged in an enclosed manner in edge areas of the touch area A in the array substrate 1 .
  • the VSS signal lines respectively disposed in areas A 1 and A 2 in FIG. 4 may be electrically connected to each other, and structures and wires provided for transmitting VSS signals to the VSS signal lines may be saved.
  • the first level signal terminal and the VSS signal line(s) are independent of each other; or, the first level signal terminal includes at least one of the VSS signal line(s).
  • the VSS signal lines are disposed in the array substrate 1 , for example, in a source-drain metal layer in the array substrate 1 .
  • the VSS signal lines are formed simultaneously with sources and drains of TFTs in the TFT array.
  • the VSS signal lines are disposed in the pixel electrode layer in the array substrate 1 .
  • the VSS signal lines may be formed simultaneously with the pixel electrodes in the pixel electrode layer. In this way, a manufacturing process of the touch display panel 200 may be simplified.
  • the first electrode strips 71 and the VSS signal lines are not disposed in a same layer, the first electrode strips 71 and the VSS signal lines are electrically connected through via holes.
  • both ends of each second electrode strip 72 are separated and electrically insulated from the VSS signal lines by the insulating film layers.
  • first level signal terminal described in some embodiments of the present disclosure is usually a low level signal terminal.
  • first level signal line is usually a low level signal line, and the “first level signal” is usually a low level signal.
  • each of the plurality of first electrode strips 71 is connected to a first level signal terminal (e.g., a VSS signal terminal) and a first touch signal terminal S 1 , and any two of the plurality of first electrode strips 71 are insulated from each other.
  • the first electrode strips 71 may be reused in a time-share manner. For example, a time of a single frame is divided into a display period t 1 and a touch period t 2 .
  • the first level signal is transmitted to each first electrode strip 71 through the first level signal terminal (e.g., the VSS signal terminal), and each first electrode strip 71 is used as an electrode of the light-emitting device in the corresponding sub-pixel region, so as to ensure that the touch display panel 200 has the display function.
  • the first touch signal is transmitted to each first electrode strip 71 through the first touch signal terminal S 1 , or first touch signals are read from the first electrode strips 71 through the first touch signal terminal S 1 , so as to achieve transmission of the first touch signal between each first electrode strip 71 and the first touch signal terminal S 1 . Since the first electrode strips are insulated from each other, the first touch signals transmitted by different first electrode strips 71 do not interfere with each other. Thereby, it may be ensured that the touch display panel 200 has the touch function.
  • the second electrode strips 72 may be not used, and the display function and the touch function of the touch display panel 200 are realized by reusing the first electrode strips 71 in a time-share manner. Therefore, in a case where the directions in which the first electrode strips 71 and the second electrode strips 72 extend are regarded as length directions thereof, a design in which a width of the first electrode strips 71 is greater than a width of the second electrode strips 72 is adopted.
  • the width of the first electrode strips 71 is set as wide as possible (the width is not limited by an area of the light-emitting layer 3 in the corresponding sub-pixel region).
  • the width of the second electrode strips 72 is set as narrow as possible.
  • insulating film layer(s) is disposed between the first electrode strips 71 and the first level signal terminal (e.g., the VSS signal terminal).
  • the first electrode strips 71 are connected to the first level signal terminal (e.g., the VSS signal terminal) through corresponding via holes disposed in the insulating film layer(s). Therefore, under a premise of ensuring mutual insulation among the first electrode strips 71 , the first level signal supplied by the first level signal terminal (e.g., the VSS signal terminal) are transmitted to the first electrode strips 71 .
  • the first level signal supplied by the first level signal terminal e.g., the VSS signal terminal
  • a shape of the touch area A of the touch display panel 200 is set to be rectangular.
  • the first electrode strips 71 and the second electrode strips 72 extend along a length direction Y of the touch area A. That is, the first electrode strips 71 and the second electrode strips 72 are parallel to a long side of the touch area A, as shown in FIG. 4 .
  • the first electrode strips 71 and second electrode strips 72 extend along a width direction X of the touch area A. That is, the first electrode strips 71 and the second electrode strips 72 are parallel to a wide side of the touch area A, as shown in FIG. 5 .
  • the design in which the first electrode strips 71 extend along the width direction X of the touch area A allows for a shorter length of the first electrodes 71 . In this way, the electric resistance on each first electrode strip 71 may be further reduced, and thus the voltage drop on the first electrode strips 71 may be further reduced.
  • the touch display panel 200 further includes: a TFE layer 5 disposed on a side of the divided electrode layer 7 away from the array substrate 1 ; and a touch electrode layer disposed on a side of the TFE layer 5 away from the array substrate 1 .
  • the touch electrode layer includes a plurality of third electrode strips 9 disposed across the plurality of first electrode strips 71 or the plurality of second electrode strips 72 .
  • the third electrode strips 9 are connected to a second touch signal terminal S 2 to transmit second touch signal(s), and any two of the third electrode strips 9 are insulated from each other.
  • the plurality of third electrode strips 9 are perpendicular to the plurality of first electrode strips 71 .
  • the plurality of third electrode strips 9 are perpendicular to the plurality of second electrode strips 72 .
  • the TFE layer 5 can protect organic light-emitting materials of the light-emitting layers 3 from being damaged by water vapor in the external environment; on another hand, the TFE layer 5 can be used as an insulating layer between the plurality of third electrode strips 9 and both the plurality of first electrode strips 71 and the plurality of second electrode strips 72 .
  • the first touch signal is a driving signal for realizing a touch function
  • the second touch signal is a sensing signal generated by sensing a touch position
  • the first electrode strips 71 are used as driving lines T of the touch structure
  • the third electrode strips 9 are used as sensing lines R of the touch structure.
  • the first electrode strips 71 are used as sensing lines R of the touch structure
  • the third electrode strips 9 are used as driving lines T of the touch structure.
  • each third electrode strip 9 is disposed in a gap region between two corresponding adjacent lines of pixel electrodes 8 .
  • an orthographic projection of each third electrode strip 9 at least partially overlaps with a gap region between orthographic projections of adjacent two lines of pixel electrodes 8 , and there is a small overlap (of course, there may be no overlap) between edges of the orthographic projection of each third electrode strip 9 along a direction in which the third electrode strips 9 extend and orthographic projections of two lines of pixel electrodes 8 located on both sides of the third electrode strip 9 .
  • a parasitic capacitance between the third electrode strips 9 and adjacent pixel electrodes 8 may be reduced, and an influence of the third electrode strips 9 on a light transmittance of the sub-pixel regions in which the third electrode strips 9 are located may be reduced.
  • the plurality of electrode dividing strips 6 divide the divided electrode layer 7 into a plurality of first electrode strips 71 and a plurality of second electrode strips 72 , such that the first electrode strips 71 are located on the surfaces of the light-emitting layers 3 away from the array substrate 1 , and the second electrode strips 72 are located on surfaces of the electrode dividing strips 6 away from the array substrate 1 .
  • each first electrode strip 71 is used as an electrode (a cathode or an anode) of the light-emitting device in a corresponding sub-pixel region
  • each second electrode strip 72 is used as a signal line (a driving line T or a sensing line R) in the touch structure.
  • the touch structure may be integrated into a display panel to obtain the touch display panel 200 .
  • the touch structure may be integrated into the display panel to obtain the touch display panel 200 by reusing the first electrode strips 71 in a time-share manner, that is, using each first electrode strip 71 as an electrode of the light-emitting device in the corresponding sub-pixel region during the display period t 1 , and as a signal line of the touch structure during the touch period t 2 .
  • the structure provided in some embodiments of the present disclosure is much simpler because an electrode of the light-emitting device and a signal line of the touch structure are in a same layer (e.g., the divided electrode layer 7 ).
  • the divided electrode layer 7 is located at an inner side of the TFE layer 5 (i.e., a side of the TFE layer 5 proximate to the array substrate 1 ). That is, in some embodiments of the present disclosure, at least a part of the touch structure is integrated inside the display panel. Therefore, the touch display panel 200 obtained by adopting such a structure is thinner and lighter.
  • the structure provided in some embodiments of the present disclosure may be able to effectively reduce an electrical resistance on a corresponding electrode in the light-emitting device and thus reduce a voltage drop on the corresponding electrode in the light-emitting device because the strip-shaped plurality of first electrode strips 71 are used as electrodes of light-emitting devices in corresponding sub-pixel regions.
  • Some embodiments of the present disclosure further provide a method of manufacturing a touch display panel. Referring to FIG. 7 , the method includes step 100 to step 400 (S 100 to S 400 ).
  • the above step of forming the array substrate includes: forming a TFT array on a base substrate, and forming a plurality of pixel electrodes on a side of the TFT array away from the base substrate.
  • the pixel electrodes are respectively connected to corresponding driving TFTs in the TFT array.
  • a pixel defining layer is formed on a side of the array substrate, and light-emitting layers are formed in sub-pixel regions defined by the pixel defining layer.
  • a patterned pixel defining layer 2 is formed on a side of the formed array substrate 1 .
  • the pixel defining layer 2 has a plurality of sub-pixel patterns that look like openings, so as to define a plurality of sub-pixel regions in the touch display panel.
  • light-emitting layers 3 are formed in openings of the sub-pixel regions defined by the pixel defining layer 2 .
  • a material of the light-emitting layer 3 is an organic light-emitting material.
  • Light-emitting layers 3 capable of emitting different colors of light are formed in different sub-pixel regions.
  • a plurality of electrode dividing strips are formed on a side of the pixel defining layer away from the array substrate, and the plurality of electrode dividing strips divide a touch area into a plurality of strip-shaped areas.
  • the step of forming a plurality of electrode dividing strips 6 on the side of the pixel defining layer 2 away from the array substrate 1 includes step 301 and step 302 (S 301 and S 302 ).
  • a photoresist layer 6 ′ is formed by a coating process on a side of the pixel defining layer 2 away from the array substrate 1 .
  • the photoresist layer 6 ′ is exposed, and developed to remove photoresist materials in regions of the photoresist layer 6 ′ other than regions where the electrode dividing strips are located.
  • the plurality of electrode dividing strips 6 are formed by remaining photoresist materials on the pixel defining layer 2 .
  • regions that need to be exposed and developed in a case where the photoresist layer 6 ′ is formed by a positive photoresist material are different from those in a case where the photoresist layer 6 ′ is formed by a negative photoresist material.
  • the regions that need to be exposed and developed are the regions of the photoresist layer 6 ′ other than regions where the electrode dividing strips are located.
  • the regions that need to be exposed and developed are the regions where the electrode dividing strips are located.
  • FIGS. 9 and 10 show an example in which the photoresist layer 6 ′ is formed of a positive photoresist material.
  • an electrode material is deposited on a side of the plurality of electrode dividing strips away from the array substrate to form a divided electrode layer.
  • the divided electrode layer is divided by the plurality of electrode dividing strips to form a plurality of first electrode strips located in the plurality of strip-shaped areas and a plurality of second electrode strips located on surfaces of the plurality of electrode dividing strips away from the array substrate, and the plurality of second electrode strips are insulated from the plurality of first electrode strips.
  • a part of the electrode material falls on the surfaces of the light-emitting layers 3 away from the array substrate 1 to form a plurality of first electrode strips 71 .
  • Another part of the electrode material falls on the surfaces of the plurality of electrode dividing strips 6 away from the array substrate 1 to form a plurality of second electrode strips 72 .
  • the plurality of first electrode strips 71 may be insulated from the plurality of second electrode strips 72 .
  • the divided electrode layer 7 is divided into a plurality of first electrode strips 71 and a plurality of second electrode strips 72 by the plurality of electrode dividing strips 6 .
  • the plurality of first electrode strips 71 are correspondingly located in the plurality of strip-shaped areas formed after the touch area is divided by the plurality of electrode dividing strips 6 , and are located on the surfaces of the light-emitting layers 3 away from the array substrate 1 .
  • the plurality of second electrode strips 72 are correspondingly located on the surfaces of the plurality of electrode dividing strips 6 away from the array substrate 1 .
  • the method of manufacturing the touch display panel further includes step 500 and step 600 (S 500 and S 600 ).
  • a TFE layer is formed on a side of the divided electrode layer away from the array substrate.
  • the TFE layer 5 is formed on the side of the divided electrode layer 7 away from the array substrate 1 . In this way, the TFE layer 5 may be used to protect the divided electrode layer 7 and light-emitting materials in the light-emitting layers 3 .
  • a touch electrode layer is formed on a side of the TFE layer away from the array substrate.
  • the touch electrode layer includes a plurality of third electrode strips disposed across the plurality of first electrode strips or the plurality of second electrode strips, and any two of the plurality of third electrode strips are insulated from each other.
  • the plurality of first electrode strips 71 are disposed in parallel with the plurality of second electrode strips 72 .
  • a plurality of third electrode strips 9 are formed on a side of the TFE layer 5 away from the array substrate 1 , such that directions in which the plurality of third electrode strips 9 extend are perpendicular to the directions in which the plurality of first electrode strips 71 extend, and the directions in which the plurality of third electrode strips 9 extend are perpendicular to the directions in which the plurality of second electrode strips 72 extend.
  • the plurality of first electrode strips 71 and the plurality of second electrode strips 72 are simultaneously formed by a film layer deposition process, which greatly simplifies the manufacturing process of the touch display panel.
  • Some embodiments of the present disclosure further provide a method of driving a touch display panel, which is applied to a touch display panel provided in some embodiments of the present disclosure.
  • a time of a single frame is a driving period t, and the method of driving the touch display panel includes one of the following two solutions.
  • Solution 1 Referring to FIGS. 4 and 5 , in a touch display panel that adopts Solution 1, at least one of the plurality of first electrode strips 71 is connected to a first level signal terminal (e.g., a VSS signal terminal), and any adjacent two of the first electrode strips 71 are shorted to each other.
  • a first level signal terminal e.g., a VSS signal terminal
  • any adjacent two of the first electrode strips 71 are shorted to each other.
  • Each of the plurality of second electrode strips 72 is connected to a first touch signal terminal S 1 , and any two of the plurality of second electrode strips 72 are insulated from each other.
  • a first level signal e.g., a VSS signal
  • the plurality of second electrode strips 72 transmit first touch signal(s) respectively.
  • each pixel electrode 8 in the touch display panel is used as an anode of the light-emitting device in a corresponding sub-pixel region.
  • the cathode and the anode together drive the light-emitting layer 3 in the light-emitting device to emit light, thereby realizing the display function of the touch display panel.
  • Solution 2 Referring to FIG. 6 , in a touch display panel that adopts Solution 2, the plurality of first electrode strips 71 are connected to a first level signal terminal (e.g., a VSS signal terminal) and a first touch signal terminal S 1 , and any two of the plurality of first electrode strips 71 are shorted to each other.
  • a time of a single frame is divided into a display period t 1 and a touch period t 2 .
  • a first level signal (e.g., a VSS signal) is applied to the plurality of first electrode strips 71 in the display period t 1 .
  • the plurality of first electrode strips 71 transmit first touch signal(s) in the touch period t 2 .
  • a duration of the vertical blanking period in a time of each frame is equal to a length of a time interval in which a scanning signal returns from a lower right corner of a screen to an upper left corner of the screen after scanning of a current frame is completed and before scanning of a next frame begins. Since the touch period t 2 is set in the vertical blanking period, normal display of the touch display panel will not be affected.
  • the VD signal is set high, and a Vertical Sync (VSYNC, abbreviated as VS in FIG. 16 ) signal and a Horizontal Sync (HSYNC, abbreviated as HS in FIG. 16 ) signal are both set low, so as to drive the touch display panel.
  • the VD signal is set low
  • the VSYNC signal is set high
  • the HSYNC signal includes a plurality of high level pulses that are sequentially output in a horizontal timing cycle, so as to drive the touch display panel.
  • each pixel electrode 8 in the touch display panel is used as an anode of the light-emitting device in a corresponding sub-pixel region.
  • the cathode and the anode together drive the light-emitting layer 3 in the light-emitting device to emit light, thereby realizing the display function of the touch display panel in the display period t 1 .
  • the second touch signal read and obtained from the third electrode strips 9 in the touch display panel is a sensing signal generated by sensing the touch position.
  • the second touch signal that need to be applied to the third electrode strips 9 in the touch display panel is a driving signal for realizing the touch function.
  • a mutual capacitance C may be formed at each intersection of the first electrode strips 71 and the third electrode strips 9 , which enables the touch display panel to have the touch function in the touch period t 2 .
  • the display function and the touch function of the touch display panel 200 may be realized by reusing the first electrode strips 71 in a time-share manner without using the second electrode strips 72 . Therefore, in a case where the directions in which the first electrode strips 71 and the second electrode strips 72 extend are regarded as the length directions thereof, the design in which the width of the first electrode strips 71 is greater than the width of the second electrode strips 72 is adopted.
  • the width of the first electrode strips 71 may not be limited by the area of the light-emitting layer 3 in the corresponding sub-pixel region, and the width of the first electrode strip 71 may be set as wide as possible. In this way, the electric resistance on each first electrode strip 71 may be further reduced, and a signal-to-noise ratio of sensing signals obtained through the first electrode strips 71 may be improved.
  • the touch display device 1001 includes a touch display panel 200 provided in some embodiments of the present disclosure.
  • the touch display device has the advantages of a simple overall structure, light weight, and simple manufacturing process.
  • the touch display device provided in some embodiments of the present disclosure is any product or component having a display function, such as an OLED panel, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.
  • a display function such as an OLED panel, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.

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CN108762561B (zh) 2021-01-15
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